Q:For the commonly used standard parts, for some of the quality of good or bad, how to distinguish,

If it is important, random to do one or two destructive pull test, their own press with a simple tooling, pay attention to safety, if their own, to the physical and chemical test units or heat treatment of the brothers can do. You can also go to the supplier to monitor the sampling of such a similar test (contract agreed).

Q:What is the fastener and others?

Department of mechanical engineering (a subject); mechanical parts (two subjects); fasteners (three subjects)

Q:Who include who btween them?

Fasteners are said from the point of view of the action, which contains both standard parts (GB ANSI ASME DIN EU JIS, etc.) and non-standard parts (according to the drawings) is not entirely a concept

Q:Bolts and other connection fasteners some points A B C grade what it means

Bolts and other fasteners connected due to a wide range of applications, the product level requirements are different, so the bolt product grade is divided into A, B, C three grades. One of the most accurate A, C level of the most inaccurate, B between the two. Class A is used for important applications where assembly accuracy is high and subject to greater impact, vibration or variable loads. Class A for d = 1.6-24mm and l ≤ 10d or l ≤ 150mm bolts. B grade for d> 24mm or l> 10d or l ≥ 150mm bolts, thin rod B grade M3-M20 hexagonal flange bolts, anti-loose performance better. Class C is between M5 and M64.

Q:What are some of the common fastener products?

The washer is a flat, rounded fastener that is typically mounted between bolts, screws, or between the support surface of the nut and the surface of the connecting part to increase the contact area of the connected part and reduce the pressure in a certain area , To ensure that the connection parts will not be damaged; there is a flexible washer, but also to prevent the nut loose situation.

Q:Will the stainless steel fastening standard parts of the national standard code and name?

This need to ask the district to do fasteners manufacturers know

Q:Is it hard to heat the fasteners?

Fasteners are a kind of standard parts, and their requirements are often higher than other standard parts, but heat treatment is better

Q:Are there categories of fasteners classified by material?

According to the use of different materials, fasteners are divided into carbon structural steel fasteners, alloy structural steel fasteners, stainless steel fasteners, high temperature alloy fasteners, aluminum alloy fasteners, titanium fasteners, titanium Niobium alloy fasteners and non-metallic fasteners.

Q:The main meaning is that the design to make some specific requirements to achieve consistency.

Easy to install, disassemble; to ensure long-term solid does not fail (life); do not exceed the standard selection, cost savings;

Q:Fasteners often say that the nature of galvanized oxidation is what it means

True color refers to the surface of the fastener is not any treatment, copper is copper color, iron is the color of iron, aluminum is the color of aluminum. Galvanized iron is the surface of the fastener coated with a layer of zinc, the role is rust. Oxidation refers to the surface of the fastener to the chemical reaction, to produce a layer of anti-rust film, the main role is rust, the other can also beautify the appearance.